Treatment of blast-furnace slag for production of material similar to trass, &amp;c.



tion of the slag and a subject of the HElNRlCH illillOldlEUl-l, OF ."illEldLlll GERMANY. TREATMENT OF BLAST-FURNACE SLAG l lllll llllllllllllflll ill MillERl/ll. alll llltllll T TRASS, dLCa' No. 817,158. Specification Letters lEatent.

Patented April 1906.

Application filed August 14,1905. fcricl No. 274,159.

To all whom, it may ooncermr Be it known that l, Hnrunrcn Coti;.,osnns,

King of Prussia, German Einperor, residing at Berlin, Germany, have iii-- vented a certain new and useful flreatment of Blast-Furnace Slag for Production of lllaterial Similar to Trees and the Like, of which the following is a specification.

This invention relates to a method for producing from blast furnace slag a hydraulic binding agent which possesses properties similar to those of trass and. other volcanic products of a liltenaturiii, l [t which is more uniform or homogeneous than the said products. The improved binding agent has, moreover, over binding agents manufactured from. the natural products referred to the ad vantages of greater tensile strength, durability and resistance.

Heretofore melted blast-furnace slag has been conducted into lime-milk, the object of this process being to facilitate the disintegra not to produce a substitute for natural trass. This process described. gives a product wliiich contains from thirty to .forty per cent of Water, which is in part chemically combined with the said product v and in )art mechanically mixed therewith trees, a peculiar that of pumice-stone,- and it l'orms an excet and before the product can be used as cc merit it must be subjected. to a drying treatment and-then disintegrated. Moreover, in said process the slag does not enter into chemical comhin ation with the lime The latter is deposited in a free state on and in the granular vitrified slag so that during the dry ing of the latter a considerable portion of the mechanicallyedhering lime lost.

The present invention differs from that above referred to and consists in injecting suitable quantities ol? lime-milk into melted blast furnace slag. The con'iparatively small quantity of Water contained in the injected. lime milk is immediately decomposed. or evaporated. by the heat ofthe slag, that the product obtained is entirely free from water and need not be subjected to a dryias; process. The said product has, lilre natui porous structure similar lent substitute for natural trees and the like.

Whereas the product obtained by the older process previously described is in the form of a mular bodies of the hardn f lass con-- taming a large proportion oi water, this improved process yie ds a product which conbles the latter in use.

.asniuch as in the processes I metal'was suddenly and all at once brought in contact with a very lug, While on only com )aratively very small uantlties of tains no trace of "water and possesses, as al' ready mentioned, a porous structure similar to that of natural truss. For building purposes the improved product is, superior to natural trass; but in other respects it resem Any hind of blastthe purposes of furnace slag can be used for the invention, even slag which is, owing to its chemical com position,

not suitable for the manufacture of cement by other methods.

I am aware that itis old to treat hot liquid sla as it comes from the furnace or immediate y thereafter that it has becnsuggested to run the stream of liquid slag, into a ll rge body of lime-water for the same purpose; but all these methods are entirely different from my invention, in-

referred ,to the hot liquid large volume the molten mass 'WStS sudof liquid, whereby broken up into fragments denly chilled and Without effecting any noticeable eva oration of the liquid and Without changing t 1, structure, specific gravity, or physical condition of the fragments as compared with those obtained by any other method of sudden coolthe contrary, in my invention a liquid raving practically no c iemical action on the components of the slag itself is introduced into the mass of molten. material in such a manner that the moltenmaterial is largely in excess of the amount of liquid incorporated or introduced therein, the amount of liquid flowing into the body of the slag as am of small successive portions of which Will immediately eva crate as a .st liquid soon as they come in contact with t. e stream of. molten material, the sudden evolution of successive small quantities of vapor Withip; tee body of the molten material producing cavities therein and changing the structure "reef, so as to impart to the mass after so nation the light pumice-dike porous struc-=. peculiar to the so-cslled natural ce :ments-such as trees, or terras, or other hinds ottrap of volcanic OIlglR-Wlll0ll are valuable as building materials and when combined with lime develop v' .'y powerful hydraulic pro erties' Without anyfurther treatment.- T ius by my invention even those slags the composition of which will TEL-- der them unsuitable for'use as hydraulic cements proper can be converted by a mere change of physical properties into a material with a large body of Water for granulatmgand chillingpurposes and Which possesses hydraulic develop the same With suitable additions ithout any further treatment.

What I claim. as my invention, and desire to secure by Letters Patent of the United States, is

1. The process of manufacturing trass-like material from blast-furnace slag, which consists'in introducing into the stream of molten liquid slag small amounts of che1nically-inactive liquid successively in' quantities sufiicient for immediate evaporation of the liquid in contact with the hot molten material.

2. The processof manufacturing trass-like material from blast-furnace slag, which consists in embodying with the molten liquid slag suitable quantities of milk of lime in properties or will 1 amounts sufficient for immediate evapora+ tion when in contact with the molten material.

3. The process of manufacturing trass-like material from blast-furnace slag, which consists in injecting and incorporating milk of lime into and with the stream of molten liquid slag in amounts sufficient for immediate evaporation of the same when in contact with the molten material.

i In Witness whereof I have signed this specification in the presence of tWo Witnesses HEINRICH GOLLOSEUS. Witnesses:

HENRY HAsPER, WILLIAM MAYNER. 

